US9574635B2 - Shock absorber - Google Patents
Shock absorber Download PDFInfo
- Publication number
- US9574635B2 US9574635B2 US14/414,974 US201314414974A US9574635B2 US 9574635 B2 US9574635 B2 US 9574635B2 US 201314414974 A US201314414974 A US 201314414974A US 9574635 B2 US9574635 B2 US 9574635B2
- Authority
- US
- United States
- Prior art keywords
- outer shell
- bellows
- piston rod
- shock absorber
- cylindrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/38—Covers for protection or appearance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/19—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/361—Sealings of the bellows-type
Definitions
- the present invention relates to a shock absorber.
- a shock absorber includes an outer shell and a piston rod that is slidably inserted into the outer shell. When the piston rod moves relatively to the outer shell in the axial direction, the shock absorber exhibits damping force that suppresses the relative movement of the piston rod relative to the outer shell.
- a shock absorber is used by being interposed between a body and an axle, or between a cabin and the body in a vehicle, for example. Vibration of an object to be damped, such as the body, the cabin or the like, can be suppressed by the damping force exhibited by the shock absorber.
- mud or the like dirt, dust and mud
- the mud or the like, adhered onto the outer periphery of the piston rod is scraped off by a dust seal that seals the outer periphery of the piston rod, when the piston rod enters the outer shell.
- a dust seal that seals the outer periphery of the piston rod, when the piston rod enters the outer shell.
- the mud or the like is dried and adhered onto the piston rod stubbornly, it cannot be scraped off properly by the dust seal. This may facilitate deterioration in oil seal provided on an inner side of the dust seal.
- a dust cover that covers the outer periphery of the piston rod is mounted so as to protect the piston rod from the mud or the like.
- the shock absorber including the dust cover as described above, the adherence of the mud or the like onto the piston rod can be prevented to a greater extent as the length of the dust cover becomes longer.
- the dust cover covers the outer shell when the outer surface of the outer shell is subjected to spray coating.
- an uncoated part is caused at the upper end of the outer shell in particular.
- the uncoated part on the outer shell like this is not preferable from the viewpoint of rust prevention on the outer shell.
- the dust cover of the shock absorber as disclosed in JP2000-81071A has such total length that slightly covers the upper end of the outer shell when it is expanded to the utmost, so that the uncoated part is not caused.
- the mud or the like easily enters the dust cover from a space between the outer shell and the dust cover, as a result of which the effect of protecting the outer periphery of the piston rod is decreased.
- the dust cover of the shock absorber as disclosed in JP2010-175043A has such total length that an entry of the mud or the like can be suppressed sufficiently. Therefore, the spray coating is carried out before attaching the dust cover.
- such processing is required as to push the piston rod into the outer shell, keep the shock absorber in the most contracted state, and then subject the outer periphery of the outer shell to the spray coating, so as to prevent a sliding surface on the outer periphery of the piston rod from being coated.
- Such processing has the need to set the shock absorber on a machine for the spray coating, and mask the outer periphery of the piston rod before coating the outer shell, and hence, the coating method becomes complicated. Thus, a new problem is caused, that is, labor and a man-hour are required for the coating processing.
- An object of the present invention is to provide a shock absorber that can protect the outer periphery of the piston rod sufficiently, and that does not deteriorate coating workability.
- a shock absorber including a cylindrical outer shell and a piston rod slidably inserted into the outer shell, the shock absorber includes a cylindrical dust cover coupled to the piston rod and that permits an entry of the outer shell to inside thereof, and a cylindrical bellows whose one end is attached to the outer shell and whose another end is arranged inside the dust cover at all times to cover an outer periphery of the piston rod.
- FIG. 1 is a side view of a shock absorber according to an embodiment of the present invention.
- FIG. 2 is a side view of a shock absorber according to a modification example of the embodiment of the present invention.
- a shock absorber 100 includes a shock absorber body D that has a cylindrical outer shell 1 and a piston rod 2 capable of sliding inside the outer shell 1 , a cylindrical dust cover 3 coupled to the piston rod 2 and permitting an entry of the outer shell 1 to inside thereof, and a cylindrical bellows 4 whose one end 4 a is attached to the outer shell 1 and the other end 4 b is arranged inside the dust cover 3 at all times to cover the outer periphery of the piston rod 2 .
- the shock absorber body D includes, for example, an inner tube that is received inside the outer shell 1 , a piston that is slidably inserted inside the inner tube, the piston rod 2 that is movably inserted into the inner tube with its one end being coupled to the piston, an expanding-side chamber and a contracting-side chamber that are divided by the piston inside the inner tube, and a passage that allows the expanding-side chamber and the contracting-side chamber to communicate.
- a hydraulic fluid such as hydraulic oil, is filled inside the expanding-side chamber and the contracting-side chamber.
- liquids such as water, aqueous solution and the like may be used as the hydraulic fluid, other than the hydraulic oil.
- the shock absorber body D according to this embodiment is a single-rod type, in which the piston rod 2 is inserted into the expanding-side chamber only. It should be noted that the shock absorber body D includes a reservoir that is formed as annular gap between the outer shell 1 and the inner tube and that has a gas and a liquid filled therein, although not illustrated. The reservoir compensates for the volume of the piston rod 2 that enters and exits from the outer shell, according to the expansion and contraction of the shock absorber body D. Thus, the shock absorber body D according to this embodiment is a single-rod multi-cylinder type.
- an air chamber that compensates for the volume of the piston rod 2 may be defined in the outer shell 1 by inserting a free piston slidably inside the outer shell 1 , or a gas chamber may be provided defined in the outer shell 1 by an elastic partition such as a bladder.
- the shock absorber body D may be a single-cylinder type without providing the inner tube.
- the shock absorber body D may be a double-rod type, not the single-rod type.
- the outer shell 1 is a cylindrical member, whose lower end in FIG. 1 is sealed by a cap 5 , and whose upper end in FIG. 1 , as the end on the piston rod side of the outer shell 1 , has a cylindrical seal case 6 mounted thereon.
- the seal case 6 includes a cylindrical large-diameter portion 6 a mounted on the inner periphery of the outer shell 1 at the end on the piston rod side, a flange portion 6 b projecting from the large-diameter portion 6 a at the end on the piston rod side toward the inner side in the radial direction, a cylindrical small-diameter portion 6 c rising from the inner periphery of the flange portion 6 b toward the upper end side, and an annular stopper 6 d provided on the small-diameter portion 6 c .
- the small-diameter portion 6 c receives a seal member 7 therein.
- the stopper 6 d has the outer diameter that is larger than the small-diameter portion 6 c , and is mounted on the upper end of the small-diameter portion 6 c by welding or the like.
- the seal member 7 includes a seal portion 7 a brought into slidable contact with the outer periphery of the piston rod 2 and sealing the outer periphery of the piston rod 2 so as to prevent leakage of the liquid from the outer shell 1 , and a dust seal portion 7 b scraping off dust adhered onto the outer periphery of the piston rod 2 .
- the dust cover 3 is mounted on an upper end 2 a of the piston rod 2 in FIG. 1 .
- the dust cover 3 includes an annular coupling portion 3 a whose inner periphery is attached to the outer periphery of the piston rod 2 , and a cover body 3 b extending downwardly in FIG. 1 from the outer periphery of the coupling portion 3 a .
- the inner diameter of the cover body 3 b is larger than the outer diameter of the outer shell 1 , and the outer shell 1 can enter the cover body 3 b .
- the dust cover 3 does not hinder the expansion and contraction of the shock absorber body D.
- the bellows 4 is formed by rubber or synthetic resin, for example.
- the bellows 4 includes a cylindrical fitting portion 4 c at the one end 4 a as the lower end in FIG. 1 .
- the fitting portion 4 c is fitted to the outer periphery of the small-diameter portion 6 c of the seal case 6 .
- the bellows 4 is attached to the outer shell 1 via the seal case 6 .
- the attachment of the bellows 4 to the outer shell 1 may be made not only in a direct manner such as a later-described shock absorber as illustrated in FIG. 2 , but also in an indirect manner via the seal case 6 or the like.
- the bellows 4 includes a bellows portion 4 d at the position higher than the fitting portion 4 c .
- An annular slide contacting portion 4 e is provided on the other end 4 b , as the end higher than the bellows portion 4 d , and the outer periphery of the slide contacting portion 4 e is brought into slidable contact with the inner periphery of the dust cover 3 .
- the other end 4 b has the larger diameter than that of the one end 4 a mounted on the outer shell 1 , and the diameter of the bellows portion 4 d is increased gradually toward the other end 4 b.
- the slide contacting portion 4 e When the shock absorber body D is contracted to the utmost, the slide contacting portion 4 e , provided on the other end 4 b of the bellows 4 , abuts against the lower end of the coupling portion 3 a of the dust cover 3 , and the bellows portion 4 d is contracted and shrunk.
- the shock absorber body D When the shock absorber body D is expanded to the utmost, the shrunk bellows portion 4 d extends, and the slide contacting portion 4 e that is provided on the other end 4 b of the bellows 4 follows the movement of the dust cover 3 toward the upper direction in FIG. 1 .
- the position of the other end 4 b of the bellows 4 when the shock absorber body D is expanded to the utmost and the bellows 4 has the natural length (the length in the axial direction when no load is applied thereto), is set at the position higher than the position of the lower end of the dust cover 3 in FIG. 1 .
- the other end 4 b of the bellows 4 is arranged inside the dust cover 3 at all times.
- the bellows 4 When the bellows 4 is mounted on the outer shell 1 as described above, the bellows 4 covers the outer periphery of the piston rod 2 , and the dust cover 3 and the bellows 4 block the space on the outer periphery of the piston rod 2 from the outside. This makes it possible to prevent the mud or the like from adhering onto the piston rod 2 .
- the attachment of the bellows 4 does not hinder spray coating onto the outer surface of the outer shell 1 , and the length of the dust cover 3 may be equal to that of the conventional shock absorber. Therefore, even when the coating is made with this state, an uncoated part is not caused on the outer surface of the outer shell 1 , and therefore, rust on the outer shell 1 can be prevented. Furthermore, it is not necessary to employ such a complicated coating method as to keep the shock absorber body D as the most contracted state before attaching the dust cover 3 , and to mask the piston rod 2 before coating the outer shell 1 . The spray coating can be carried out without any change. Thus, coating processing is quite simple.
- shock absorber 100 of this embodiment as described thus far, it is possible to protect the outer periphery of the piston rod 2 sufficiently, and to prevent deterioration in coating workability.
- the bellows 4 covers the outer periphery of the piston rod 2 , the bellows 4 functions as a liquid reservoir. Because of this, even when the liquid inside outer shell 1 gets over the seal member 7 and oozes to the outside, it makes possible to prevent the leakage of the liquid to the outside of the shock absorber.
- the structure of fixing the bellows to the outer shell may be different from the above-described structure.
- the shock absorber as illustrated in FIG. 2 includes a bending portion 10 a that is the upper end of an outer shell 10 being bent toward the inner side at the end on the piston rod side in FIG. 2 .
- the bending portion 10 a fixes a seal member 11 that seals the outer periphery of the piston rod 2 and a rod guide 12 that pivotally supports the outer periphery of the piston rod 2 to the outer shell 10 .
- annular fixing portion 13 b that is inserted into the inner periphery of the outer shell 10 at the end on the piston rod side may be provided at one end 13 a of a bellows 13 , so as to fix the bellows 13 to the outer shell 10 , as the fixing portion 13 b holds the bending portion 10 a.
- the annular fixing portion 13 b that is fixed to the bending portion 10 a of the outer shell 10 may be formed separately from the bellows 13 , although not illustrated.
- a flange is provided on the outer periphery of the one end 13 a of the bellows 13 , and a holding portion that forms gap in which the flange is inserted between itself and the rod guide 12 is provided on the inner periphery of the fixing portion 13 b .
- the flange is sandwiched between the holding portion of the fixing portion 13 b and the rod guide 12 , so as to fix the bellows 13 to the outer shell.
- the fixing portion 13 b may be made of metal or by the same material as that of the bellows 13 .
- a bellows portion 13 c of the bellows 13 is made of rubber and the fixing portion 13 b is made of metal, for example, the rubber that forms the bellows portion 13 c may be welded, fused, adhered or the like to the fixing portion 13 b for integration.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012177902A JP5873406B2 (ja) | 2012-08-10 | 2012-08-10 | 緩衝器 |
JP2012-177902 | 2012-08-10 | ||
PCT/JP2013/069858 WO2014024669A1 (ja) | 2012-08-10 | 2013-07-23 | 緩衝器 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20150167775A1 US20150167775A1 (en) | 2015-06-18 |
US9574635B2 true US9574635B2 (en) | 2017-02-21 |
Family
ID=50067903
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/414,974 Active US9574635B2 (en) | 2012-08-10 | 2013-07-23 | Shock absorber |
Country Status (5)
Country | Link |
---|---|
US (1) | US9574635B2 (ja) |
JP (1) | JP5873406B2 (ja) |
CN (1) | CN104487730B (ja) |
DE (1) | DE112013004010T5 (ja) |
WO (1) | WO2014024669A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190142161A1 (en) * | 2016-06-03 | 2019-05-16 | Kyb Corporation | Overturn preventing device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6001954B2 (ja) * | 2012-08-10 | 2016-10-05 | Kyb株式会社 | 緩衝器 |
DE102014210703B4 (de) * | 2014-06-05 | 2021-08-12 | Zf Friedrichshafen Ag | Kolben-Zylindereinheit |
CN108708838A (zh) * | 2018-05-30 | 2018-10-26 | 靖西市秀美边城农业科技有限公司 | 一种波纹管缓冲器 |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2163255A (en) | 1938-04-03 | 1939-06-20 | Binder Richard | Hydraulic shock absorber of the piston and cylinder type |
US3165306A (en) * | 1961-08-10 | 1965-01-12 | Ford Motor Co | Resilient stop means |
US3391922A (en) * | 1965-12-17 | 1968-07-09 | Fichtel & Sachs Ag | Hydropneumatic suspension element |
US3399882A (en) * | 1966-01-08 | 1968-09-03 | Bilstein August Kg | Hydraulic shock absorber assembly with parallel-connected gas spring and automatically controllable damping, particularly for motor vehicles |
DE2845243A1 (de) * | 1978-10-18 | 1980-04-30 | Audi Nsu Auto Union Ag | Faltenbalg fuer ein teleskopierbares bauteil |
US4249645A (en) * | 1978-05-29 | 1981-02-10 | Automobiles Peugeot | Protecting device in particular for a rod of a telescopic shockabsorber |
JPS59197635A (ja) | 1983-04-22 | 1984-11-09 | Bridgestone Corp | 空気ばね付油圧ダンパ− |
JPH0165439U (ja) | 1987-10-16 | 1989-04-26 | ||
EP0457658A1 (fr) * | 1990-05-17 | 1991-11-21 | Creusot Loire Industrie | Acier inoxydable pour utilisation en milieux aquatiques naturels |
JP2000081071A (ja) | 1998-09-04 | 2000-03-21 | Showa Corp | 油圧緩衝器のダストカバー |
JP2007071246A (ja) | 2005-09-05 | 2007-03-22 | Kayaba Ind Co Ltd | ダストブーツ |
JP2010116997A (ja) | 2008-11-14 | 2010-05-27 | Kayaba Ind Co Ltd | ダストシール構造 |
JP2010175043A (ja) | 2009-01-30 | 2010-08-12 | Hitachi Automotive Systems Ltd | シリンダ装置の製造方法 |
-
2012
- 2012-08-10 JP JP2012177902A patent/JP5873406B2/ja active Active
-
2013
- 2013-07-23 WO PCT/JP2013/069858 patent/WO2014024669A1/ja active Application Filing
- 2013-07-23 DE DE201311004010 patent/DE112013004010T5/de not_active Withdrawn
- 2013-07-23 US US14/414,974 patent/US9574635B2/en active Active
- 2013-07-23 CN CN201380039092.8A patent/CN104487730B/zh not_active Expired - Fee Related
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2163255A (en) | 1938-04-03 | 1939-06-20 | Binder Richard | Hydraulic shock absorber of the piston and cylinder type |
US3165306A (en) * | 1961-08-10 | 1965-01-12 | Ford Motor Co | Resilient stop means |
US3391922A (en) * | 1965-12-17 | 1968-07-09 | Fichtel & Sachs Ag | Hydropneumatic suspension element |
US3399882A (en) * | 1966-01-08 | 1968-09-03 | Bilstein August Kg | Hydraulic shock absorber assembly with parallel-connected gas spring and automatically controllable damping, particularly for motor vehicles |
US4249645A (en) * | 1978-05-29 | 1981-02-10 | Automobiles Peugeot | Protecting device in particular for a rod of a telescopic shockabsorber |
DE2845243A1 (de) * | 1978-10-18 | 1980-04-30 | Audi Nsu Auto Union Ag | Faltenbalg fuer ein teleskopierbares bauteil |
JPS59197635A (ja) | 1983-04-22 | 1984-11-09 | Bridgestone Corp | 空気ばね付油圧ダンパ− |
JPH0165439U (ja) | 1987-10-16 | 1989-04-26 | ||
EP0457658A1 (fr) * | 1990-05-17 | 1991-11-21 | Creusot Loire Industrie | Acier inoxydable pour utilisation en milieux aquatiques naturels |
JP2000081071A (ja) | 1998-09-04 | 2000-03-21 | Showa Corp | 油圧緩衝器のダストカバー |
JP2007071246A (ja) | 2005-09-05 | 2007-03-22 | Kayaba Ind Co Ltd | ダストブーツ |
JP2010116997A (ja) | 2008-11-14 | 2010-05-27 | Kayaba Ind Co Ltd | ダストシール構造 |
JP2010175043A (ja) | 2009-01-30 | 2010-08-12 | Hitachi Automotive Systems Ltd | シリンダ装置の製造方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190142161A1 (en) * | 2016-06-03 | 2019-05-16 | Kyb Corporation | Overturn preventing device |
Also Published As
Publication number | Publication date |
---|---|
JP2014035048A (ja) | 2014-02-24 |
US20150167775A1 (en) | 2015-06-18 |
CN104487730B (zh) | 2016-06-15 |
JP5873406B2 (ja) | 2016-03-01 |
CN104487730A (zh) | 2015-04-01 |
DE112013004010T5 (de) | 2015-04-23 |
WO2014024669A1 (ja) | 2014-02-13 |
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AS | Assignment |
Owner name: KAYABA INDUSTRY CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TAKEO, SATORU;REEL/FRAME:034725/0360 Effective date: 20141225 |
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Owner name: KYB CORPORATION, JAPAN Free format text: CHANGE OF NAME;ASSIGNOR:KAYABA INDUSTRY CO., LTD.;REEL/FRAME:037355/0142 Effective date: 20151001 |
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Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |